Iain Churches wrote:
> "Ian Thompson-Bell" <ruffrecords@[EMAIL PROTECTED]
> wrote in message
> news:fukk52$pbo$1@[EMAIL PROTECTED]
>
>> Iain Churches wrote:
>>> Hi Ian. I use Sprint layout. There is a free trial version also
>>> http://www.abacom-online.de/uk/html/sprint-layout.html
>>>
>> Does this include footprints for tube bases??
>>
> There is an extensive macro library of resistors, caps, transistors,
> regulators, etc. But no tube bases. I am told one can write your
> own, but I have never needed to do this.
>
> I never put the tube base on the board anyway. I use a
> construction method that I have seen in British mil spec
> equipment with a metal sub-plate to which the tube-bases are
> fixed, below the amp top panel. The PCB is fixed below the
> plate with 3mm machine screws and standoffs. . There is a
> hole in the PCB about the size of the tube base, and short
> wires are soldered to the base tags, and taken out to pads
> or turrets on the PCB.
>
> The military used red for anode, blue for cathode and green for grid.
> I do the same.
>
> http://www.kolumbus.fi/iain.churches/Pics/105Board05.jpg
>
>
Excellent idea, and the metal plate acts as a screen too. Neat.
Cheers
Ian
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